ECU Grounds... Where are they?

[btwilson86]

So... I have a code 11 when I run diagnostics (disrupted power to ECU). I'm told that it's most likely a bad ground or short somewhere, as the car still runs fine. I found somewhere on this forum the pin out diagram for the ECU on a 1990 N/A Auto tranny. I have a 87 N/A Auto, so I'm wondering if the grounds between the two ECU's are the same. Anyone know? Cuz I heard that in 89 or something they added a sensor that detects a high altitude to adjust the air/fuel mixture, and I'm hoping that Toyota just utilized an unused pin on the ECU.

I've also been told that the housing on ECU's in some later model Toyotas are the computer ground, and that just bolts to the frame to get grounded....

It's all kind of giving me a headache, and I don't particularly want to ruin my ECU by grounding a wire that shouldn't be grounded, so if anyone has any ideas, it'd be very much appreciated.